Star Micronics TSP200 Feed-Motor Drive Circuit, Motor Control by Phase 1-2 Excitation

PRINCIPLES OF OPERATION

STB1

STB2

STB3

HD ON

(B)

BEO

(Q)

Trigger

Retrigger Retrigger

tw

Fig. 2-9 Timing Chart

2-3. Feed-Motor Drive Circuit

The printer uses a 4-phase step motor (phase 1-2 excitation) to implement paper feed. The motor rotates through a certain angle each time it receives a pulse from the drive circuit. The following diagram illustrates the excitation method. Figure 2-11 shows the feed-motor drive circuit.

1

ON

ON

2

3

4

Step

1 2

ON

ON

ON

3 4 5 6 7 8

Forward Feed

Reverse Feed

Fig. 2-10 Motor Control by Phase 1-2 Excitation

IC1

CPU

PB4

TP8

TP9

TP10

TP11

	+24V	CN7
DT9	TR5
		1
		2
	TA1
		6	1
		3	2
		5	3
		4	4

M-GND

Fig. 2-11 Feed-Motor Drive Circuit

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